/Engine/Plugins/MovieScene/SequencerScripting/Source/SequencerScripting/Public/ExtensionLibraries/MovieSceneSectionExtensions.h
Find all channels that belong to the specifiedUMovieSceneSection. Some sections have many channels (such as Transforms containing 9 double channels to represent Translation/Rotation/Scale), and a section may have mixed channel types.
An array containing any key channels that match the type specified
[UFUNCTION](Programming/UnrealArchitecture/Reference/Functions)(BlueprintCallable, Category="Sequencer|Section", Meta=(ScriptMethod, DevelopmentOnly)) static [TArray](API\Runtime\Core\Containers\TArray)< UMovieSceneScriptingChannel * > GetAllChannels ( [UMovieSceneSection](API\Runtime\MovieScene\UMovieSceneSection) * Section )